Update git submodules

* Update docs/submodules/functest from branch 'stable/euphrates'
  - Fix userdata issue for vping and orchestra

    1. When creating VM, the type of the param userdata should be str, to
       conform with that in snaps [1].
    2. Remove the infinite loop for vping in userdata
    3. Fix the criteria for vping_userdata and vping_ssh

    [1]: https://git.opnfv.org/snaps/tree/snaps/openstack/utils/nova_utils.py#n92

    Change-Id: I262a7ebb93ec90bb6f8f3acb5d564f210abcfc4b
    Signed-off-by: Linda Wang <wangwulin@huawei.com>
    (cherry picked from commit 5a24cb4a7db33e693a063f5c2a66406283aa5cfb)

diff --git a/docs/submodules/functest b/docs/submodules/functest
index f83d853..82f5223 160000 (submodule)
--- a/docs/submodules/functest
+++ b/docs/submodules/functest
@@ -1 +1 @@
-Subproject commit f83d8530bf34c1f2aa29fef0a3030a11a9ed4fa7
+Subproject commit 82f52235de1d6ebfc4a54f4fc40c8b8aa8fa44e0